Centrifuges - Marine fuel centrifuges - Determination of particle separation performance and certified flow rate (CFR) under defined test conditions

This document specifies the procedure for the determination of the certified flow rate (CFR), a performance parameter for centrifuges, at specific fuel oil viscosities using a defined test oil and a defined test procedure.
This document is applicable to marine fuel centrifuges.
All values reported as CFR capacities are verified measured values on a defined CFR test bench.
Scaling based on Stoke’s law and disc stack design is excluded from this document.
Separation efficiency is determined by a defined particle counting method.

Zentrifugen - Zentrifugen für Schiffskraftstoffe - Bestimmung der Partikelabscheideleistung und der zertifizierten Durchflussrate (CFR) unter definierten Testbedingungen

Dieses Dokument legt das Verfahren zur Bestimmung der zertifizierten Durchflussrate (CFR), eines Leistungsparameters für Zentrifugen, bei spezifischen Schwerölviskositäten unter Zuhilfenahme eines definierten Prüföls und einer definierten Prüfmethode fest.
Dieses Dokument ist anwendbar auf Zentrifugen für Schiffskraftstoffe.
Alle als CFR-Kapazitäten angegebenen Werte sind verifizierte Messwerte, die an einem definierten CFR-Prüfstand erlangt wurden.
Skalierung basierend auf dem Stokes'schen Gesetz sowie Tellerkonstruktionen werden in diesem Dokument nicht behandelt.
Die Abscheideleistung wird durch eine definierte Partikelzählmethode bestimmt.

Centrifugeuses - Centrifugeuses à combustible pour la marine - Détermination des performances de séparation des particules et du débit certifié (CFR) dans des conditions d'essai définies

Le présent document spécifie le mode opératoire permettant de déterminer le débit certifié (CFR), un paramètre de performance pour les centrifugeuses, à des viscosités d'huile lourde spécifiques, en utilisant une huile d'essai définie et un mode opératoire d'essai défini.
Le présent document s'applique aux centrifugeuses à combustible pour la marine.
Toutes les valeurs déclarées comme des capacités CFR sont des valeurs mesurées vérifiées sur un banc d'essai CFR défini.
La mise à l'échelle fondée sur la loi de Stokes et la conception de la pile de disques est exclue du présent document.
L'efficacité de séparation est déterminée par une méthode de comptage des particules définie.

Centrifuge - Centrifuge za ladijska goriva - Določanje učinkovitosti ločevanja delcev in certificirane stopnje pretoka (CFR) pod določenimi preskusnimi pogoji

General Information

Status
Not Published
Current Stage
4599 - Dispatch of FV draft to CMC - Finalization for Vote
Due Date
28-Mar-2022
Completion Date
28-Mar-2022

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SLOVENSKI STANDARD
oSIST prEN 17763:2021
01-december-2021
Centrifuge - Centrifuge za ladijska goriva - Določanje učinkovitosti ločevanja
delcev in certificirane stopnje pretoka (CFR) pod določenimi preskusnimi pogoji

Centrifuges - Marine fuel centrifuges - Determination of particle separation performance

and certified flow rate (CFR) under defined test conditions
Zentrifugen - Zentrifugen für Schiffskraftstoffe - Bestimmung der

Partikelabscheideleistung und der zertifizierten Durchflussrate (CFR) unter definierten

Testbedingungen
Centrifugeuses - Centrifugeuses à combustible pour la marine - Détermination des

performances de séparation des particules et du débit certifié (CFR) dans des conditions

d'essai définies
Ta slovenski standard je istoveten z: prEN 17763
ICS:
47.020.20 Ladijski motorji Marine engines and
propulsion systems
oSIST prEN 17763:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 17763:2021
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oSIST prEN 17763:2021
DRAFT
EUROPEAN STANDARD
prEN 17763
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2021
ICS 47.020.20
English Version
Centrifuges - Marine fuel centrifuges - Determination of
particle separation performance and certified flow rate
(CFR) under defined test conditions

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 313.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17763:2021 E

worldwide for CEN national Members.
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oSIST prEN 17763:2021
prEN 17763:2021 (E)
Contents Page

European foreword ............................................................................................................................................ 3

Introduction .......................................................................................................................................................... 4

1 Scope .......................................................................................................................................................... 5

2 Normative references .......................................................................................................................... 5

3 Terms and definitions ......................................................................................................................... 5

4 Test arrangements ............................................................................................................................... 6

4.1 Test equipment ...................................................................................................................................... 6

4.2 Test media ............................................................................................................................................... 8

4.2.1 Test oil specification ............................................................................................................................ 8

4.2.2 Test oil kinematic viscosity ............................................................................................................... 8

4.2.3 Test oil density ....................................................................................................................................... 9

4.2.4 Test oil dispersing additive ............................................................................................................... 9

4.2.5 Test particle specification ................................................................................................................. 9

5 Performance test ................................................................................................................................... 9

5.1 Oil viscosity ............................................................................................................................................. 9

5.2 Particle concentration ........................................................................................................................ 9

5.3 Dispersing of particles into test medium ..................................................................................... 9

5.4 Test sequence ....................................................................................................................................... 10

5.5 Test procedure ..................................................................................................................................... 10

5.6 Sampling ................................................................................................................................................. 11

5.7 Particle counting ................................................................................................................................. 11

6 Analysis .................................................................................................................................................. 12

6.1 Calculation of separation efficiency ............................................................................................. 12

6.2 Calculation of Certified Flow Rate (CFR) .................................................................................... 12

6.3 Correction of measured capacities ............................................................................................... 12

7 CFR results for similar machines (scaling) ................................................................................ 12

8 Test report ............................................................................................................................................. 12

Annex A (informative) Dispersing the particles in the test medium ............................................. 14

Annex B (informative) Regeneration of test particle concentration ............................................. 15

Annex C (normative) Particle counting .................................................................................................... 16

Annex D (informative) Example of correction of measured capacities ........................................ 27

Bibliography ....................................................................................................................................................... 28

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oSIST prEN 17763:2021
prEN 17763:2021 (E)
European foreword
This document (prEN 17763:2021) has been prepared by Technical Committee
CEN/TC 313 “Centrifuges”, the secretariat of which is held by SIS.
This document is currently submitted to the CEN Enquiry.
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oSIST prEN 17763:2021
prEN 17763:2021 (E)
Introduction

In general, diesel engines for propulsion of ships burn marine residual fuels. Marine residual fuels contain

the residue remaining after lighter fractions have been extracted from the crude oil during various

processes in the oil refinery. They are a blend of this heavy fraction to which other refinery stream

products are added to obtain the desired viscosity grade. Marine residual fuel oils contain elements

inherent to the product itself but they also contain some contaminants, which either are due to an

external contamination or enter into the fuel at the refinery during production, such as catalyst fines

which are small fragments of a catalyst, used in the catalytic cracking stage in order to cut long molecule

chains into smaller molecule chains. The catalyst fines are extremely hard and abrasive, and, if not

removed from marine residual fuel, can damage diesel engines with severe economic and, in extreme

cases, safety consequences. The normal way of removing catalyst fines and other contaminants from

marine residual fuel is by centrifugal separation.

It is important that all fuels are centrifuged efficiently to minimize the level of contaminants, including

catalyst fines.

In bunkered oil the maximum content of catalyst fines, expressed as the total content of Aluminium and

Silicon, is 60 mg/kg according to ISO 8217. Engine builders expect the level of catalyst fines to be reduced

to below 10 mg/kg, only reaching to 15 mg/kg for short amounts of time in the fuel entering the engine.

As the level of catalyst fines in the bunkered fuel is lowered, the engine builders expect a related reduction

in the amount of catalyst fines in the fuel entering the engine.

For many years now there has been a demand from engine builders, ship builders, ship owners and

classification societies for reliable performance criteria for the centrifuges’ ability to remove abrasive

particles from marine residual fuels. The purpose of this document is to meet this demand by specifying

a repeatable method to determine separation performance with specific test particles in specific test oil.

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oSIST prEN 17763:2021
prEN 17763:2021 (E)
1 Scope

This document specifies the procedure for the determination of the certified flow rate (CFR), a

performance parameter for centrifuges, at specific fuel oil viscosities using a defined test oil and a defined

test procedure.
This document is applicable to marine fuel centrifuges.

All values reported as CFR capacities are verified measured values on a defined CFR test bench.

Scaling based on Stoke’s law and disc stack design is excluded from this document.

Separation efficiency is determined by a defined particle counting method.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN ISO 3104, Petroleum products - Transparent and opaque liquids - Determination of kinematic viscosity

and calculation of dynamic viscosity (ISO 3104)

EN ISO 3675, Crude petroleum and liquid petroleum products - Laboratory determination of density -

Hydrometer method (ISO 3675)

EN ISO 3838, Crude petroleum and liquid or solid petroleum products - Determination of density or relative

density - Capillary-stoppered pyknometer and graduated bicapillary pyknometer methods (ISO 3838)

EN ISO 12185, Crude petroleum and petroleum products - Determination of density - Oscillating U-tube

method (ISO 12185)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
separation efficiency
measure of a centrifuge's capability to remove test specific contaminants
Note 1 to entry: The separation efficiency, η, is calculated as follows:
η = 100 ∙ (1 – C /C ) (1)
out in
where
η is separation efficiency in %;
C is number of the test specific particles in cleaned test oil;
out
C is number of the test specific particles in test oil before centrifuge.
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oSIST prEN 17763:2021
prEN 17763:2021 (E)
3.2
certified flow rate
CFR
rate of flow under defined conditions

Note 1 to entry: Certified Flow Rate is determined at a certain time after sludge discharge, at which the separation

efficiency of the centrifuge is 85 %, using a specific test oil and specific test particles under specific test conditions.

The Certified Flow Rate is expressed in l/h.
3.3
density difference
difference of density between particles and oil

Note 1 to entry: Where the difference of density deviates from the nominal values correction for the deviation shall

be made as described in 6.3.
4 Test arrangements
4.1 Test equipment
General arrangement of the test equipment is shown in Figure 1.
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oSIST prEN 17763:2021
prEN 17763:2021 (E)
Key

T01 system tank or mixing tank (sufficient size for test run without refilling) with stirrer

T02 reception tank (sufficient size to match T01)
T03 hot water tank
E01 heat exchanger (used for heating)
E02 heat exchanger (used for cooling)
P1 hot water pump (centrifugal type)
P2 regeneration pump
P3 system pump or circulation pump (adjustable screw pump)
C01 centrifuge
SV1 safety relief valve
CV1 control valve
I/P I/P converter
TC1 temperature controller (PID type)
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oSIST prEN 17763:2021
prEN 17763:2021 (E)
TT temperature transmitter
TT1 temperature transmitter and sensor (combined accuracy ±0,1 °C)
TT2 temperature transmitter and sensor (combined accuracy ±0,1 °C)
TT3 temperature transmitter and sensor (combined accuracy ±0,1 °C)
PT pressure transmitter
PT1 pressure transmitter (accuracy ±0,1 bar)
PT2 pressure transmitter (accuracy ±0,1 bar)
FT flow meter
FT1 flow meter (screw type) (accuracy ±1 %)
H heating coil
CW cold water
HV1 regulating valve
HV2 stop valve
HV3 stop valve
HV4 regulating valve
HV5 3-way valve
HV6 regulating valve
HV7 sample valve
HV8 sample valve (always open during test)
A oil pipe
B oil pipe, insulated
C water pipe
Figure 1 — Test rig
4.2 Test media
4.2.1 Test oil specification
The test oil shall be an automotive lube oil of type PAO 6.

NOTE PAO 6 is a polyalphaoleofin oil used as a base for synthetic lubricating oils.

4.2.2 Test oil kinematic viscosity

The kinematic viscosity of the test oil shall be measured according to EN ISO 3104. The kinematic

viscosity shall be expressed as:
10 / T
υ = 10 + C (2)
where
υ the kinematic viscosity in mm /s;
T is the temperature in Kelvin (K);
A, B and C are constants related to the actual test oil.

The formula shall be used with three accurately measured values of temperature and corresponding

viscosities for finding A, B and C. The chosen temperatures should for practical reasons be one at each

end of a measuring range of about 20 °C to 60 °C, and one in between. The formula shall then be used

again for determining the two correct temperatures for the desired viscosities (see 5.1) for the tests. The

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viscosity shall be measured after adding the dispersant in 4.2.4. The calibration certificates of both

viscosity and temperature meter shall be added to the final report.
4.2.3 Test oil density

The test oil density shall be measured according to EN ISO 3838 or EN ISO 3675 or EN ISO 12185 at the

two temperatures at which tests are to be made, taking into account appropriate corrections. The choice

of which document to be used shall be based on the equipment used by the laboratory that executes the

test.
4.2.4 Test oil dispersing additive

To achieve the dispersing properties of the test medium, a minimum amount of an appropriate dispersing

additive of borated bis-succinimide type can be added to the PAO 6 type oil base. No more additive than

what is necessary to disperse the particles shall be added (suggested addition is 0,3 % by weight). The

density and the viscosity of the test medium in tank T01, see Figure 1, shall be measured after the

dispersing additive has been added.
4.2.5 Test particle specification

To simulate catalytic fines and other fuel contaminants, monodispersed plastic 5 µm particles (spheres)

with a composition of 45 % polystyrene and 55 % divinylbenzene shall be used. The density of the

spheres shall be (1 050 ± 10,5) kg/cm . The size variation shall not be more than ± 2,5 %, equal

to ± 0,125 µm. The actual density and size of the particles shall be measured. If the size deviates from the

nominal 5,00 µm but is within the accepted limit 5,00 µm ± 0,125 µm, a correction for the deviation shall

be made as described in 6.3.
5 Performance test
5.1 Oil viscosity
2 3

To simulate a typical heavy fuel of 380 mm /s at 50 °C and a maximum density of 1 010 kg/m , the test

2 2

oil shall be heated to the temperature corresponding to a viscosity of 35 mm /s ± 1,4 mm /s according

to the method described in 4.2.2. Where the viscosity during tests deviates from the nominal value of

2 2 2

35 mm /s but is within the accepted limit 35 mm /s ± 1,4 mm /s, correction shall be made as described

in 6.3.
2 3

To simulate a typical heavy fuel of 700 mm /s at 50 °C and a maximum density of 1 010 kg/m , the test

2 2

oil shall be heated to the temperature corresponding to a viscosity of 55 mm /s ± 2,2 mm /s according

to the method described
...

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